STUDY OF TAUTOMERISM IN A SERIES OF MONOAZOPIGMENTS BASED ON 1-PHENYLAZO-2-OXY-3-PHENYLCARBAMOYLNAPHTHALENE T.M. IVANOVA, E.D. SYCHEVA, B.E. ZAITSEV, E.S. LISITSINA, E.I. POLYAKOVA and K.M. DYUMAEV J. Phys. Colloques, 48 C9 (1987) C9-737-C9-740 DOI: 10.1051/jphyscol:19879126